As a family of 3 in New York City, one of our largest expenses are groceries. Groceries in the city are way pricier than in other parts of the country (boy, do I miss Jewel-Osco). We spend, on average, about $9,000 a year (or $750 a month) on food purchased from FreshDirect and other local stores.
One of the ways I hack this expense is by using the right credit. We exclusively use our Blue American Express because this card offers a whopping 6% on groceries (up to $6,000, max $390). When we had a car, we used it for gas (3% cash back) as well. 1% is earned on all other purchases. Each year, I make about $420 off groceries alone. FYI there is a $75 annual fee but it is quickly offset by other purchases. Interested in signing up? Email me and I'll send you a referral link so you can earn: $150 back after they spend $1,000 in purchases on their new Card in their first 3 months of Card Membership. They will receive $150 back in the form of a statement credit (I get $50 per referral). Using the right credit card for the right purchases (or at the right time) is the key to many of my life hacks.